Buildroot-based VPN server

buildroot.config

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+BR2_x86_athlon_4=y
+BR2_KERNEL_HEADERS_VERSION=y
+BR2_DEFAULT_KERNEL_VERSION="3.12.16"
+BR2_UCLIBC_CONFIG="$(TOPDIR)/../uClibc-0.9.33.panda.config"
+BR2_TOOLCHAIN_BUILDROOT_LARGEFILE=y
+BR2_TOOLCHAIN_BUILDROOT_INET_IPV6=y
+BR2_TOOLCHAIN_BUILDROOT_LOCALE=y
+BR2_TOOLCHAIN_BUILDROOT_USE_SSP=y
+BR2_BINUTILS_VERSION_2_24=y
+BR2_GCC_VERSION_4_8_X=y
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_GENERATE_LOCALE="en_US.UTF-8 de_DE.UTF-8"
+BR2_TARGET_GENERIC_HOSTNAME="panda"
+BR2_TARGET_GENERIC_PASSWD_SHA256=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
+BR2_ROOTFS_OVERLAY="$(TOPDIR)/../overlay"
+BR2_ROOTFS_CUSTOM_FAKEROOT="$(TOPDIR)/../fakeroot.fs"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.12.16"
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(TOPDIR)/../linux-3.12.16.config"
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+BR2_PACKAGE_XZ=y
+BR2_PACKAGE_DOSFSTOOLS=y
+BR2_PACKAGE_LINUX_FIRMWARE=y
+BR2_PACKAGE_CA_CERTIFICATES=y
+BR2_PACKAGE_DHCPCD=y
+BR2_PACKAGE_IPROUTE2=y
+BR2_PACKAGE_IPTABLES=y
+BR2_PACKAGE_IPUTILS=y
+BR2_PACKAGE_OPENSSH=y
+BR2_PACKAGE_OPENVPN=y
+BR2_PACKAGE_BASH=y
+BR2_PACKAGE_SUDO=y
+BR2_TARGET_ROOTFS_CPIO=y
+BR2_TARGET_ROOTFS_CPIO_XZ=y
+BR2_TARGET_SYSLINUX=y
+# BR2_TARGET_SYSLINUX_ISOLINUX is not set
+# BR2_TARGET_SYSLINUX_PXELINUX is not set